Precision die forging process of copper alloy and aluminum alloy superplastic forming
Die forging plays an important role in the manufacture of alloys, particularly hard alloys. Die forging process has two basic requirements: one is the material should have good formability and plasticity, and the other is that the die forging temperature should not be too low, so as not to reduce the plasticity too much. Superplastic forming is a special die forging process which has the advantages of high formability, high precision and fast speed. In the process of superplastic forming, the alloy particles are filled with mesh structure, which greatly increases the formability.
Superplastic forming of copper alloy and aluminum alloy
Copper alloy and aluminum alloy are important forming materials in the field of modern materials. As a kind of superior engineering structural material, copper alloy and aluminum alloy have the characteristics of high strength, good thermal conductivity and corrosion resistance. Copper alloy and aluminum alloy are the most commonly used materials in die forging because they have good plasticity and can improve their physical properties under certain forging conditions. In the superplastic forming process of copper alloy and aluminum alloy, the actual forming temperature is generally in the range of 500-800℃.
The forming pressure of superplastic forming of copper alloy and aluminum alloy is usually about three times the forging force of ordinary parts. Superplastic forming of copper alloy is conducted in contact with argon gas, which can improve the surface quality of parts and the temperature of superplastic forming can be effectively controlled. For the aluminum alloy, due to its lower thermal conductivity and plasticity, monomer can be used to join together. The forming pressure of superplastic forming of aluminum alloy is lower than that of copper alloy, and the forming temperature is slightly higher.
Process flow of precision die forging
1. Pre-process: The raw materials of the parts need to be tested and preheated before the die forging. The chemical composition, phase composition and mechanical properties of different parts are different, so it is necessary to select the appropriate forging parameters according to the different parts to avoid unnecessary losses.
2. Forming: The forging process includes pre-forging, forging and superplastic forming. Electromagnetic blanking or powder pressing technology can be adopted in pre-forging. In the actual forming process, the requirements of forming accuracy, shape and surface quality should be fully considered.
3. Post-treatment: Die forging process needs further machining after forming. Generally, the die forging process can achieve better machining accuracy by using EDM to finish the surface and achieve the desired dimensional tolerance.
Conclusion
Die forging is one of the important processes for forming metal parts. The purpose of die forging process is to obtain parts with low cost and high precision. Copper alloy and aluminum alloy die forging process has the advantage of good plasticity, and superplastic forming technology can further improve the forming effect and accuracy of parts. In the actual production process, the forming parameters of different materials and parts should be reasonably selected according to the requirements of forming accuracy and surface quality of parts, so as to better ensure the product quality.
